Denton and collaborator Andy Griffiths have taken time off from writing The 130-Storey Treehouse - the 10th in the popular Treehouse series - to support children and young people striking on Friday.

"When we have a case where the supposed adults in charge are not taking any heed of the science or accepting the reality of climate scientists across the world, the kids have an absolutely valid point to say, 'Why should we be in school learning anything if you're not going to show that you respect learning and science as well?' " Griffiths said.

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The Global Climate Strike, which grew out of the School Strike 4 Climate, will be held around the world on Friday. The Sydney rally kicks off at noon in The Domain and the Melbourne event in Treasury Gardens from 2pm.

Griffiths said children experienced "anxiety and anger" when they couldn't trust adults to "tell the truth and act on the truth" when it comes to the climate crisis. He wanted students attending the rally to know they had the "support of the Treehouse gang" to counter negativity from people who object to children protesting when they should be in school.

The cartoon, which was drawn exclusively for the Herald and The Age.Credit:Terry Denton

Denton defended the right of children's book authors to raise these issues.

"Andy and I work mainly in humour and nonsense humour but there's no reason we shouldn't be bringing up issues relevant to kids," he said. "A lot of authors I know who write junior fiction bring up issues in their fiction and writers in other generations like John Marsden brought up social issues they felt strongly about, too."

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The fictional treehouse from series which goes up by 13 storeys each book, has regenerators and solar panels, but Griffiths said the next bookwould take the theme further.

"We're going to need possibly a kelp farm to help with the drawdown of carbon and to help feed everyone in the treehouse and we'll need a solar power tower," Griffiths said. "Part of the frustration of this whole thing is the solutions are already there, they're just waiting for political will power."

Griffiths said the series, while not overtly political, had a serious underlying purpose to improve children's literacy.

Meanwhile, Girl Geek Academy, a project to teach 1 million women technology skills by 2025, is also backing the strike.

In 2017, Project Drawdown, a group of researchers, scientists, business leaders and policymakers, ranked educating girls as the sixth most powerful solution to combat climate change, ahead of electric cars at 26 and forest protection at 38.